Thanks 900, Just at Home Depot, I found an aluminum extrusion comes in lengths about 36`` long about 2`` wide it is either for use on windows or doors not exactly sure. This profile has a small lip on one side and the opposite side will fit tight into it. Then built a small square tube frame under it and a few pop rivets, you could also weld this together. Mount on the tunnel to either side of the cooler with pop rivets from underneath. I will try and find a piece of this profile in the shop post a pic for you. Never had a problem with it so far. I am sure there is alot of different ideas for this, that would work.